Disable OutOfProcessPPAPITest.MouseLock_SucceedWhenAllowed on Win,Mac

TBR=lukasza@chromium.org

Bug: 1048148
Change-Id: I7393ce564ea09535810cf2b77c7854b05af1e1f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033770Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737760}

chrome/test/ppapi/ppapi_interactive_browsertest.cc

@@ -14,12 +14,12 @@
 // Disable tests under ASAN.  http://crbug.com/104832.
 // This is a bit heavy handed, but the majority of these tests fail under ASAN.
 // See bug for history.
-#if defined(ADDRESS_SANITIZER)
+// Flaky on Win/Mac, http://crbug.com/1048148.
+#if defined(ADDRESS_SANITIZER) || defined(OS_WIN) || defined(OS_MACOSX)
 #define MAYBE_MouseLock_SucceedWhenAllowed DISABLED_MouseLock_SucceedWhenAllowed
 #else
 #define MAYBE_MouseLock_SucceedWhenAllowed MouseLock_SucceedWhenAllowed
 #endif  // ADDRESS_SANITIZER
-// Disabled due to timeouts: http://crbug.com/136548
 IN_PROC_BROWSER_TEST_F(OutOfProcessPPAPITest,
                        MAYBE_MouseLock_SucceedWhenAllowed) {
   RunTestViaHTTP("MouseLock_SucceedWhenAllowed");